Golang time. Problem with Duration () troubleshoot

This is a creation in Article, where the information may have evolved or changed.

Original: How to multiply duration by integer?

See a piece of code in the Golang project,

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You had to cast it to a correct format Playground .

yourTime := rand.Int31n(1000)time.Sleep(time.Duration(yourTime) * time.Millisecond)

If you'll check documentation for sleep, you see that it requires func Sleep(d Duration) duration as a parameter. Your Rand. INT31N returns int32 .

The line from the example works ( time. Sleep (* time. Millisecond) ) because the compiler is smart enough to understand, here your constant 100 means a Dura tion. If you pass a variable, you should cast it.